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Journal Articles

Effect of Direction and Frequency of Skull Motion on Mechanical Vulnerability of the Human Brain

Ruth J. Okamoto, Jordan D. Escarcega, Ahmed Alshareef, Aaron Carass, Jerry L. Prince, Curtis L. Johnson, Philip V. Bayly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. November 2023, 145(11): 111005.
Paper No: BIO-22-1344
https://doi.org/10.1115/1.4062937
Published Online: August 8, 2023
View Article titled, Effect of Direction and Frequency of Skull Motion on Mechanical Vulnerability of the Human Brain
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Topics: Brain, Displacement, Excitation, Kinetic energy, Deformation, Rotation, Biological tissues, Waves
Includes: Supplementary data
Proceedings Papers

Optimization of Material Properties of Passive Myocardium Using Epicardial Suction

Ruth J. Okamoto, Julius M. Guccione, Michael J. Moulton, Michael K. Pasque
Proc. ASME. IMECE96, Advances in Bioengineering, 413-414, November 17–22, 1996
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1996-1290
https://doi.org/10.1115/IMECE1996-1290
View Paper titled, Optimization of Material Properties of Passive Myocardium Using Epicardial Suction
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Topics: Materials properties, Myocardium, Optimization, Suction, Biological tissues, Magnetic resonance imaging, Deformation, Diseases, Displacement, Finite element analysis
Journal Articles

Comparison of Deformation Patterns Excited in the Human Brain In Vivo by Harmonic and Impulsive Skull Motion

Jordan D. Escarcega, Andrew K. Knutsen, Ahmed A. Alshareef, Curtis L. Johnson, Ruth J. Okamoto, Dzung L. Pham, Philip V. Bayly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. August 2023, 145(8): 081006.
Paper No: BIO-22-1312
https://doi.org/10.1115/1.4062809
Published Online: June 30, 2023
View Article titled, Comparison of Deformation Patterns Excited in the Human Brain In Vivo by Harmonic and Impulsive Skull Motion
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Topics: Brain, Deformation, Magnetic resonance imaging, Tensors, Elastography, Magnetic resonance
Includes: Supplementary data
Proceedings Papers

Imaging of Focused Ultrasound-Induced Shear Waves to Probe Mechanical Anisotropy of Tissue

Charlotte A Guertler, Ruth J Okamoto, Joel R Garbow, Hong Chen, Philip V Bayly
Proc. ASME. DMD2021, 2021 Design of Medical Devices Conference, V001T12A005, April 12–15, 2021
Publisher: American Society of Mechanical Engineers
Paper No: DMD2021-1030
https://doi.org/10.1115/DMD2021-1030
View Paper titled, Imaging of Focused Ultrasound-Induced Shear Waves to Probe Mechanical Anisotropy of Tissue
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Topics: Anisotropy, Biological tissues, Elastography, Imaging, Magnetic resonance, Probes, Shear waves, Simulation, Ultrasound
Journal Articles

Multi-Excitation Magnetic Resonance Elastography of the Brain: Wave Propagation in Anisotropic White Matter

Daniel R. Smith, Charlotte A. Guertler, Ruth J. Okamoto, Anthony J. Romano, Philip V. Bayly, Curtis L. Johnson
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. July 2020, 142(7): 071005.
Paper No: BIO-19-1033
https://doi.org/10.1115/1.4046199
Published Online: March 4, 2020
View Article titled, Multi-Excitation Magnetic Resonance Elastography of the Brain: Wave Propagation in Anisotropic White Matter
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Topics: Anisotropy, Brain, Elastography, Excitation, Magnetic resonance, Wave propagation, Waves, Displacement
Journal Articles

Estimation of Anisotropic Material Properties of Soft Tissue by MRI of Ultrasound-Induced Shear Waves

Charlotte A. Guertler, Ruth J. Okamoto, Jake A. Ireland, Christopher P. Pacia, Joel R. Garbow, Hong Chen, Philip V. Bayly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. March 2020, 142(3): 031001.
Paper No: BIO-19-1429
https://doi.org/10.1115/1.4046127
Published Online: February 28, 2020
View Article titled, Estimation of Anisotropic Material Properties of Soft Tissue by MRI of Ultrasound-Induced Shear Waves
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Topics: Anisotropy, Biological tissues, Displacement, Fibers, Polarization (Electricity), Polarization (Light), Polarization (Waves), Shear modulus, Shear waves, Simulation
Journal Articles

Shear Wave Propagation and Estimation of Material Parameters in a Nonlinear, Fibrous Material

Zuoxian Hou, Ruth J. Okamoto, Philip V. Bayly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. May 2020, 142(5): 051010.
Paper No: BIO-19-1172
https://doi.org/10.1115/1.4044504
Published Online: January 20, 2020
View Article titled, Shear Wave Propagation and Estimation of Material Parameters in a Nonlinear, Fibrous Material
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Topics: Fibers, Shear (Mechanics), Shear waves, Waves
Journal Articles

Erratum: “The Relationship of Three-Dimensional Human Skull Motion to Brain Tissue Deformation in Magnetic Resonance Elastography Studies” (ASME J. Biomech. Eng., 2017, 139 (5), p. 051002; DOI: 10.1115/1.4036146 ) to Paper Number BIO-16-1363

Andrew A. Badachhape, Ruth J. Okamoto, Ramona S. Durham, Brent D. Efron, Sam J. Nadell, Curtis L. Johnson, Philip V. Bayly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Errata
J Biomech Eng. December 2018, 140(12): 127001.
Paper No: BIO-17-1588
https://doi.org/10.1115/1.4040947
Published Online: September 25, 2018
View Article titled, Erratum: “The Relationship of Three-Dimensional Human Skull Motion to Brain Tissue Deformation in Magnetic Resonance Elastography Studies” (ASME J. Biomech. Eng., 2017, 139 (5), p. 051002; DOI: 10.1115/1.4036146 ) to Paper Number BIO-16-1363
Open the PDF for Erratum: “The Relationship of Three-Dimensional Human Skull Motion to Brain Tissue Deformation in Magnetic Resonance Elastography Studies” (ASME J. Biomech. Eng., 2017, 139 (5), p. 051002; DOI: 10.1115/1.4036146 ) to Paper Number BIO-16-1363 in another window
Topics: Biological tissues, Brain, Deformation, Elastography, Errors, Magnetic resonance, Encryption, Displacement, Calibration
Journal Articles

The Relationship of Three-Dimensional Human Skull Motion to Brain Tissue Deformation in Magnetic Resonance Elastography Studies

Andrew A. Badachhape, Ruth J. Okamoto, Ramona S. Durham, Brent D. Efron, Sam J. Nadell, Curtis L. Johnson, Philip V. Bayly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. May 2017, 139(5): 051002.
Paper No: BIO-16-1363
https://doi.org/10.1115/1.4036146
Published Online: March 21, 2017
View Article titled, The Relationship of Three-Dimensional Human Skull Motion to Brain Tissue Deformation in Magnetic Resonance Elastography Studies
Open the PDF for The Relationship of Three-Dimensional Human Skull Motion to Brain Tissue Deformation in Magnetic Resonance Elastography Studies in another window
Topics: Accelerometers, Biological tissues, Brain, Gelatin, Phantoms, Displacement
Proceedings Papers

Automated Estimation of Elastic Material Parameters of a Transversely Isotropic Material Using Asymmetric Indentation and Inverse Finite Element Analysis

Yuan Feng, Chung-Hao Lee, Lining Sun, Ruth J. Okamoto, Songbai Ji
Proc. ASME. IMECE2015, Volume 3: Biomedical and Biotechnology Engineering, V003T03A007, November 13–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2015-51112
https://doi.org/10.1115/IMECE2015-51112
View Paper titled, Automated Estimation of Elastic Material Parameters of a Transversely Isotropic Material Using Asymmetric Indentation and Inverse Finite Element Analysis
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Topics: Finite element analysis, Biological tissues, Anisotropy, Fibers, Optimization, Brain, Isotropy, Muscle, Simulation, Soft tissues
Proceedings Papers

Identification of Anisotropic Material Parameters in Elastic Tissue Using Magnetic Resonance Imaging of Shear Waves

Dennis J. Tweten, Ruth J. Okamoto, John L. Schmidt, Joel R. Garbow, Philip V. Bayly
Proc. ASME. IDETC-CIE2015, Volume 8: 27th Conference on Mechanical Vibration and Noise, V008T13A106, August 2–5, 2015
Publisher: American Society of Mechanical Engineers
Paper No: DETC2015-46539
https://doi.org/10.1115/DETC2015-46539
View Paper titled, Identification of Anisotropic Material Parameters in Elastic Tissue Using Magnetic Resonance Imaging of Shear Waves
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Topics: Anisotropy, Biological tissues, Magnetic resonance imaging, Shear waves, Materials properties, Polarization (Electricity), Polarization (Light), Polarization (Waves), Waves, Brain
Proceedings Papers

Mechanics of Aortic Smooth Muscle Cells in Tissue Constructs: Effects of Matrix Composition

Wei Du, Kenneth M. Pryse, Elliot L. Elson, Ruth J. Okamoto
Proc. ASME. SBC2008, ASME 2008 Summer Bioengineering Conference, Parts A and B, 515-516, June 25–29, 2008
Publisher: American Society of Mechanical Engineers
Paper No: SBC2008-192905
https://doi.org/10.1115/SBC2008-192905
View Paper titled, Mechanics of Aortic Smooth Muscle Cells in Tissue Constructs: Effects of Matrix Composition
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Topics: Biological tissues, Muscle, Diseases, Stress, Cardiovascular system, Fibers, Mechanical behavior
Proceedings Papers

Vascular Smooth Muscle Cell Mechanics During Cyclic Stretch: Effect of Serum and a Serum Substitute

Wei Du, Kenneth M. Pryse, Judy A. Fee, Elliot L. Elson, Ruth J. Okamoto
Proc. ASME. SBC2007, ASME 2007 Summer Bioengineering Conference, 267-268, June 20–24, 2007
Publisher: American Society of Mechanical Engineers
Paper No: SBC2007-176205
https://doi.org/10.1115/SBC2007-176205
View Paper titled, Vascular Smooth Muscle Cell Mechanics During Cyclic Stretch: Effect of Serum and a Serum Substitute
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Topics: Cellular mechanics, Muscle, Biological tissues, Diseases, Stress, Cardiovascular system, Fibers
Proceedings Papers

Anisotropic Behavior of White Matter in Shear and Implications for Transversely Isotropic Models

Ruth J. Okamoto, Yuan Feng, Guy M. Genin, Philip V. Bayly
Proc. ASME. SBC2013, Volume 1A: Abdominal Aortic Aneurysms; Active and Reactive Soft Matter; Atherosclerosis; BioFluid Mechanics; Education; Biotransport Phenomena; Bone, Joint and Spine Mechanics; Brain Injury; Cardiac Mechanics; Cardiovascular Devices, Fluids and Imaging; Cartilage and Disc Mechanics; Cell and Tissue Engineering; Cerebral Aneurysms; Computational Biofluid Dynamics; Device Design, Human Dynamics, and Rehabilitation; Drug Delivery and Disease Treatment; Engineered Cellular Environments, V01AT10A002, June 26–29, 2013
Publisher: American Society of Mechanical Engineers
Paper No: SBC2013-14039
https://doi.org/10.1115/SBC2013-14039
View Paper titled, Anisotropic Behavior of White Matter in Shear and Implications for Transversely Isotropic Models
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Topics: Anisotropy, Shear (Mechanics), Fibers, Brain, Density, Tensors
Proceedings Papers

Shear Wave Propagation of the Ferret Brain at Multiple Frequencies In Vivo

Yuan Feng, Yulin Chang, Erik H. Clayton, Ruth J. Okamoto, Philip V. Bayly
Proc. ASME. IMECE2012, Volume 2: Biomedical and Biotechnology, 779-785, November 9–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2012-88374
https://doi.org/10.1115/IMECE2012-88374
View Paper titled, Shear Wave Propagation of the Ferret Brain at Multiple Frequencies In Vivo
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Topics: Brain, Shear waves, Biological tissues, Computer simulation, Elastography, Magnetic resonance, Mechanical properties, Modeling, Storage, Traumatic brain injury
Proceedings Papers

Identification of a Transversely Isotropic Material Model for White Matter in the Brain

Yuan Feng, Ruth J. Okamoto, Ravi Namani, Guy M. Genin, Philip V. Bayly
Proc. ASME. IMECE2012, Volume 2: Biomedical and Biotechnology, 787-794, November 9–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2012-88610
https://doi.org/10.1115/IMECE2012-88610
View Paper titled, Identification of a Transversely Isotropic Material Model for White Matter in the Brain
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Topics: Brain, Anisotropy, Biological tissues, Fibers, Traumatic brain injury, Engineering simulation, Simulation
Proceedings Papers

The Apparent Flexural Rigidity of the Flagellar Axoneme Depends on Resistance to Inter-Doublet Sliding

Gang Xu, Kate S. Wilson, Ruth J. Okamoto, Jin-Yu Shao, Susan K. Dutcher, Philip V. Bayly
Proc. ASME. SBC2012, ASME 2012 Summer Bioengineering Conference, Parts A and B, 397-398, June 20–23, 2012
Publisher: American Society of Mechanical Engineers
Paper No: SBC2012-80220
https://doi.org/10.1115/SBC2012-80220
View Paper titled, The Apparent Flexural Rigidity of the Flagellar Axoneme Depends on Resistance to Inter-Doublet Sliding
Open the PDF for The Apparent Flexural Rigidity of the Flagellar Axoneme Depends on Resistance to Inter-Doublet Sliding in another window
Topics: Deformation, Engines, Feedback, Fluids, Motors, Proteins, Stiffness
Proceedings Papers

The Dominant Mechanical Interaction Between the Brain and Skull In Vivo : Is Sliding Arrested at Key Points of Brain-Skull Tethering?

Teresa M. Abney, Y. Aaron Feng, Robert Pless, Ruth J. Okamoto, Guy M. Genin, Philip V. Bayly
Proc. ASME. SBC2010, ASME 2010 Summer Bioengineering Conference, Parts A and B, 907-908, June 16–19, 2010
Publisher: American Society of Mechanical Engineers
Paper No: SBC2010-19466
https://doi.org/10.1115/SBC2010-19466
View Paper titled, The Dominant Mechanical Interaction Between the Brain and Skull In Vivo : Is Sliding Arrested at Key Points of Brain-Skull Tethering?
Open the PDF for The Dominant Mechanical Interaction Between the Brain and Skull In Vivo : Is Sliding Arrested at Key Points of Brain-Skull Tethering? in another window
Topics: Brain, Displacement, Computational mechanics, Imaging, Magnetic resonance, Magnetic resonance imaging, Phantoms, Traumatic brain injury
Proceedings Papers

Validation of Magnetic Resonance Elastography by Dynamic Shear Testing in the Shear Wave Regime

Ruth J. Okamoto, Erik H. Clayton, Kate S. Wilson, Philip V. Bayly
Proc. ASME. SBC2010, ASME 2010 Summer Bioengineering Conference, Parts A and B, 391-392, June 16–19, 2010
Publisher: American Society of Mechanical Engineers
Paper No: SBC2010-19124
https://doi.org/10.1115/SBC2010-19124
View Paper titled, Validation of Magnetic Resonance Elastography by Dynamic Shear Testing in the Shear Wave Regime
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Topics: Elastography, Magnetic resonance, Shear (Mechanics), Shear waves, Testing, Shear modulus, Biological tissues, Biomaterials, Brain, Bridges (Structures)
Journal Articles

Mechanical Properties of Viscoelastic Media by Local Frequency Estimation of Divergence-Free Wave Fields

Erik H. Clayton, Ruth J. Okamoto, Philip V. Bayly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research-Article
J Biomech Eng. February 2013, 135(2): 021025.
Paper No: BIO-12-1447
https://doi.org/10.1115/1.4023433
Published Online: February 7, 2013
View Article titled, Mechanical Properties of Viscoelastic Media by Local Frequency Estimation of Divergence-Free Wave Fields
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Topics: Anisotropy, Displacement, Mechanical properties, Shear modulus, Waves, Biological tissues, Wave propagation, Shear waves, Viscoelastic materials, Viscoelasticity